Direct top-quark decay width measurement in the tt ̄ lepton+jets channel at √s = 8 TeV with the ATLAS experiment

This paper presents a direct measurement of the decay width of the top quark using tt ̄ events in the lep- ton+jets final state. The data sample was collected by the ATLAS detector at the LHC in proton–proton collisions at a centre-of-mass energy of 8 TeV and corresponds to an integrated luminosity...

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Detalles Bibliográficos
Autores principales: Alconada Verzini, María Josefina, Alonso, Francisco, Arduh, Francisco Anuar, Dova, María Teresa, Hoya, Joaquín, Monticelli, Fernando Gabriel, Wahlberg, Hernán Pablo, The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2018
Materias:
Ciencias Exactas
Física
top-quark decay
lepton+jets
ATLAS detector
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/78340
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
Descripción
Sumario:This paper presents a direct measurement of the decay width of the top quark using tt ̄ events in the lep- ton+jets final state. The data sample was collected by the ATLAS detector at the LHC in proton–proton collisions at a centre-of-mass energy of 8 TeV and corresponds to an integrated luminosity of 20.2 fb−1. The decay width of the top quark is measured using a template fit to distribu- tions of kinematic observables associated with the hadroni- cally and semileptonically decaying top quarks. The result, Γt = 1.76 ± 0.33 (stat.) +0.79 −0.68 (syst.) GeV for a top-quark mass of 172.5 GeV, is consistent with the prediction of the Standard Model.

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